/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.configuration;

import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.constant.Constant;
import proguard.classfile.editor.*;
import proguard.classfile.instruction.Instruction;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.util.*;
import proguard.optimize.peephole.*;

import static proguard.configuration.ConfigurationLoggingInstructionSequenceConstants.LOCAL_VARIABLE_INDEX_1;
import static proguard.configuration.ConfigurationLoggingInstructionSequenceConstants.LOCAL_VARIABLE_INDEX_2;
import static proguard.configuration.ConfigurationLoggingInstructionSequenceConstants.LOCAL_VARIABLE_INDEX_3;

/**
 * This InstructionSequencesReplacer appends logging instructions to all instructions calling reflection methods.
 *
 * @see InstructionSequenceReplacer
 *
 * @author Johan Leys
 */
public class ConfigurationLoggingInstructionSequenceReplacer extends InstructionSequenceReplacer {
    public ConfigurationLoggingInstructionSequenceReplacer(InstructionSequenceMatcher instructionSequenceMatcher,
        Constant[] patternConstants, Instruction[] patternInstructions, Constant[] replacementConstants,
        Instruction[] replacementInstructions, BranchTargetFinder branchTargetFinder,
        CodeAttributeEditor codeAttributeEditor, InstructionVisitor extraInstructionVisitor) {
        super(instructionSequenceMatcher, patternConstants, patternInstructions, replacementConstants,
            replacementInstructions, branchTargetFinder, codeAttributeEditor, extraInstructionVisitor);
    }

    public ConfigurationLoggingInstructionSequenceReplacer(Constant[] patternConstants,
        Instruction[] patternInstructions, Constant[] replacementConstants, Instruction[] replacementInstructions,
        BranchTargetFinder branchTargetFinder, CodeAttributeEditor codeAttributeEditor) {
        super(patternConstants, patternInstructions, replacementConstants, replacementInstructions, branchTargetFinder,
            codeAttributeEditor);
    }

    public ConfigurationLoggingInstructionSequenceReplacer(Constant[] patternConstants,
        Instruction[] patternInstructions, Constant[] replacementConstants, Instruction[] replacementInstructions,
        BranchTargetFinder branchTargetFinder, CodeAttributeEditor codeAttributeEditor,
        InstructionVisitor extraInstructionVisitor) {
        super(patternConstants, patternInstructions, replacementConstants, replacementInstructions, branchTargetFinder,
            codeAttributeEditor, extraInstructionVisitor);
    }

    @Override
    protected int matchedArgument(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, int argument) {
        switch (argument) {
            case LOCAL_VARIABLE_INDEX_1:
                return codeAttribute.u2maxLocals;
            case LOCAL_VARIABLE_INDEX_2:
                return codeAttribute.u2maxLocals + 1;
            case LOCAL_VARIABLE_INDEX_3:
                return codeAttribute.u2maxLocals + 2;
            default:
                return super.matchedArgument(clazz, argument);
        }
    }

    @Override
    protected int matchedConstantIndex(ProgramClass programClass, int constantIndex) {
        switch (constantIndex) {
            case ConfigurationLoggingInstructionSequenceConstants.CLASS_NAME:
                return new ConstantPoolEditor(programClass)
                    .addStringConstant(ClassUtil.externalClassName(programClass.getName()), programClass, null);
            default:
                return super.matchedConstantIndex(programClass, constantIndex);
        }
    }
}
